in-

بَادِئَة بِمَعْنَى النَّفي (لا، غير)‏ \ in-: not: Incomplete means not complete. ("it" becomes "il-" before "l", "im-" before "m" or "p", "ir-" before "r": "Ill"egal, "im"moral, "im"patient, "ir"regular. It does not change the pronunciation of the word after it.).